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problemchild 09-12-2004, 12:31 AM Well my sudden HUGE drop in mpg has me baffled. It happened about the time I went from amsoil to delo. Could non-synthetic make a 5-6 mpg difference? Im getting about 200+ from a tank now and it used to be near 400+. Jim659 09-12-2004, 12:56 AM I went from 16 mpg with dino to 19.5 with amsoil 5w-30. problemchild 09-12-2004, 01:02 AM wow maybe that is what happened SAYWHAT 09-12-2004, 07:45 AM I have over 44,000 miles on my truck, half with dino,half with synthetic.No difference in mileage period! salesrep 09-12-2004, 08:46 AM pc 5-6% or 5-6 mpg? problemchild 09-12-2004, 10:12 AM Well I was getting 15.8 avg in town and 18.7 fwy (better without ac and no speeding up to 20.7) and now im getting 9.8 and 14.3...... NWDmax 09-12-2004, 11:16 AM No oil would cause that kind of drop.Your problem lies elsewhere...... Jim659 09-12-2004, 12:22 PM I'm sorry you did'nt see any impovement with synthetic oil, but on my cummins with over 80,000 miles on it now 60,000 with synthetic I saw similar results period! NWDmax 09-12-2004, 01:22 PM 4 to 6 mpg difference with an oil change only?http://www.dieselplace.com/forum/smileys/Ermm.gif With those kind of numbers I'll be getting 26 mpg soon!http://www.dieselplace.com/forum/smileys/HiHi.gifhttp://www.dieselplace.com/forum/smileys/HiHi.gif Blake DavesDmax 09-12-2004, 03:25 PM PC, Do a search on milage and injectors. I think that is one of the signs of injector failure. Man, unless you're hammering the crap out of that truck, something is seriously wrong on the fuel consumption. My worse milage was pulling a 6k TT with 4 people and a dog back from Hilton Head, SC through the mountains at 70 mph. That was only 11.7 mpg. Normal unloaded higway/city is about 17 mpg for me. How did the dealer visit go?Edited by: DavesDmax BRUCE 09-12-2004, 05:57 PM PC: I believe my mileage went up some but ( no brag ) I was getting great mileage before change over. Biggest change I saw was drop in engine temps 4-5 degrees. Jim659 09-12-2004, 08:14 PM When I change my oil to synthetic I do the whole truck. Differentials, tranny, transfer case and anything else that requires lubrication. Also when switching over is when I start my power mods. I have noticed that with electronic power upgrades( depending on your right foot )that they can also help with mileage. I agree that PCs problem sounds like something else besides a switch from synthetics. | ||